On 3/22/2021 2:23 PM, John C Klensin wrote:
Ned, Laura,
Just a thought, based on little thinking and less information:
Are there any plausible circumstances in which a system might
want to encourage rolling up a few MXs but not very many? If
so, that would turn it into a limit, rather than requiring a
separate announcement keyword. I'm having trouble imagining
such a case, so, if the answer is "no", don't bother with a
detailed explanation. However, because I think there is value
in minimizing the number of announcements, the question seems
worth asking.
If I may ....
If you are referring to situations similar to where private domains
are being hosting by a 3rd party vendors or even a free ESP network,
i.e. private-domain.com hosted by Yahoo's MX or by Microsoft MX's,
etc, yes, it has created a delivery problem. The Outbound Queuing
Strategies (OQS) need to be adjusted/sorted by MX (and thus IP). A
rule that may say: "My-Special-Customer.Com gets sending priority over
gmail.com" no longer applies when the special customer has decided to
be hosted by gmail.com.
--
Hector Santos,
https://secure.santronics.com
https://twitter.com/hectorsantos
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